Exercise bicycle



FIG. 1 is an isometric view of the exercise bicycle;

FIG. 2 is a first side view of the exercise bicycle;

FIG. 3 is a front view of the exercise bicycle;

FIG. 4 is a second side view of the exercise bicycle;

FIG. 5 is a rear view of the exercise bicycle;

FIG. 6 is a top view of the exercise bicycle; and,

FIG. 7 is a bottom view of the exercise bicycle.

The broken lines illustrate portions of the exercise bicycle which formno part of the claimed design.

The ornamental design for an exercise bicycle, as shown and described.